To install LXDE, just sudo apt-get install lxde. After that, the system will be booting to LXDE by default. You need to sudo raspi-config and pick the text login as default. The LXDE Desktop.sh is this

#!/bin/bash
startx

The Redefine ES Keys.sh goes like this

#!/bin/bash
rm /home/pi/.emulationstation/es_input.cfg
sudo reboot

The Retroarch Joystick Configure.sh goes like this

#!/bin/bash
echo Reconfiguring Retroarch joysticks
echo Make sure your joystick is plugged in
echo .
cd /opt/retropie/emulators/retroarch/
./retroarch-joyconfig -o /opt/retropie/configs/all/retroarch.cfg
exit

After you create and place those .sh files inside your apps folder, make sure you chmod +x *.sh them

Not that fancy, I know, but they do what they are supposed to do :)